%0 Journal Article %T Non-stationary elastic wavefields from an apodized normal transducer. Near-field asymptotics and numerics %+ Propagation des Ondes : Étude Mathématique et Simulation (POEMS) %A Bécache, Eliane %A Kiselev, Aleksei %< avec comité de lecture %@ 1610-1928 %J Acta Acustica united with Acustica %I Hirzel Verlag %V 91 %N 5 %P 822-830 %8 2005 %D 2005Journal articles %X We simulate non-stationary radiating near-field of a normal transducer acting at the surface of an isotropic homogeneous elastic half-space. The transducer is assumed large compared to the characteristic wavelength. Effects of non-constance of distribution of pressure over the aperture of the transducer on the wavefield are considered in detail. These are i) excitation of a plane S-wave, ii) anomalous polarization in the plane P-wave, and iii) suppression of edge waves by an apodization of the pressure distribution. Asymptotic formulas are tested against a numerical method based on new mixed finite elements. The agreement is found excellent within the bounds of the asymptotic theory. %G English %L hal-00982677 %U https://ensta-paris.hal.science/hal-00982677 %~ ENSTA %~ CNRS %~ INRIA %~ IRISA %~ INRIA-SACLAY %~ INRIA_TEST %~ TESTALAIN1 %~ UMA_ENSTA %~ INRIA2 %~ UR1-MATH-STIC %~ UR1-UFR-ISTIC %~ INRIA-300009 %~ UR1-MATH-NUM